Magnesium alloy



Patented May 9, 1939 UNITED STATES PATENT OFFICE MAGNESIUM ALLOY FritzChristen, Zurich-Altstetten, Switzerland No Drawing. Application March5, 1938, Serial 1 Claim.

such alloys are employed for producing elements which are subjected tovarying working temperatures.

A further disadvantage resides in that although by altering theadditives it is certainly possible to obtain an increasing tensilestrength,

18 the malleability is reduced.

The object of the present invention is to eliminate these disadvantagesof such alloys. with this object in view and in accordance with thepm'pose to which the alloys are put, the pre-alloy according tothe-invention is added in an amount lying within the range of 4-12%whereby the hardness and the mechanical strength of the resultantalloy'is increased and the possibility of further working for example.by forging, rolling and the like is favorably influenced.

The pre-alloy according to the invention has the following composition:

. Percent (1) Aluminium' s 33 (22) Zinc 23.5-16.5 (8) Copper 17.5-14.5(4) Manganese 3.- 6 (5) Nickel 1 s (6) Cobalt 6. 4 $5 ('1) Chromium0.5-0.9 (8) Molybdenum 0.5- 0-1 (9) Magnesium (constant) 15 Inaccordance with the use of rising or falling percentages of thecorresponding elements 1 and 2, 3 and 4, 5 and 6, "l and 8 and inaccordance In Switzerland December 30,

with the choice of the percentage 01 the prealloy which is added to thealloy, the properties of the latter are effected in respect of strength,behaviour under the action of heat, sliding and frictional properties,and capacity for being 5 worked. a

Example The pre-alloy consisting of the above composition and producedin a suitable manner is m added in a preheated condition at about 100 C.to the actual magnesium melt or to the melt of the magnesium alloy if analloy is to be improved, the percentage added being within theprescribed limits. The added pre-alloy slowly dissolvesin 5 the melt.

During this melting operation the customary flux rises to the surfaceand covers the melt; When everything has'be'come fluid the melt isthoroughly stirred and heated further to go SOB-900 C.

Then the crucible is removed from the furnace and after waiting someminutes for it to cool down to the casting temperature of (00-750 0.,the alloy is cast into pigs or moulded blocks.

I claim:

As an article of new manufacture for use in r the production ofmagnesium alloys, a pre-alloy of the following composition:

- Percent 30 (1) Aluminium 33 -40 (2) Zinc 23.5-16.5 (3) Copper17.5-14.5 (4) Manganese 3 6 I (5) Nickel..- 1 3 (6) Cobalt -6 4 ('1)Chromium 0.5- 0.9 (8) Molybdenum 0.5- 0.1 (9) Magnesium (constant) 15FRI'IZ CHRISTEN.

